Download file on click - Ruby on Rails

My application is using Rails 2 backend, Heroku for hosting, Paperclip for file uploads, and Amazon S3 for file storage.

Right now users can upload files with paperclip + s3 - this works flawlessly. After upload, an icon appears on their dashboard, linked to the file location (in s3 bucket). When the icon is clicked, the browser opens the file in a new window (for most file types - PDF, MP3, img, etc). Instead of opening, I want the file to be automatically downloaded when the user clicks the file's icon (like Gmail attachments). The solution should be able to work for any file type and cross-browser.

Is there a helper to do this in rails, or is javascript needed? I'm really stuck on this one so anything to point me in the right direction would be开发者_如何学编程 greatly appreciated. Thanks!

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Please try the following:

class Test < ActiveRecord::Base

  has_attached_file :testfile, 
    :storage => :s3,
    # All your S3 config
    :s3_headers => {"Content-Disposition" => "attachment"}

end

This should tell the Paperclip Gem to set the "Content-Disposition" header to the value "attachment" for newly uploaded files.

Note that you have to manually edit the already uploaded file, e.g. with Cyberduck or another FTP Client.

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When you transfer the file, you need to set a Content-Disposition header with a value of attachment; filename=yourfilename.pdf. If it's transfered directly from S3, you'll need to tell S3 to set the Content-Disposition headers as well. Possibly also Content-Type.

Note that if you tell S3 to associate a Content-Disposition header, it will always transmit this header.

FWIW, here's Amazon's documentation on doing a PUT for an Object: http://docs.amazonwebservices.com/AmazonS3/latest/API/RESTObjectPUT.html